Teledyne 8800A/8800B - Panel / Wall mount trace moisture analyzer - Manual (Page 20)

Section 3: Instrument
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to operate from 15 to 30 VDC 0.5A, with an internal 0.5A fast acting fuse. Please follow the
appropriate installation procedures in the paragraphs below according to the electrical power
option on your instrument. Do not connect to AC power without a proper ground connection.
For Intrinsically Safe installations, first make sure that the equipment is qualified for the particu-
lar installation, it should have a label specifying the certifications and the approving agency. Then
follow the appropriate control drawing as well as the instructions in the relevant paragraphs in this
manual.
3.3.2.1.1 AC Mains Electrical Power Connection
The 8800 Series Trace Moisture Analyzer is provided with a 6 foot (2 meter) internationally
approved AC power cord, terminated with a connector according to the ordered option. This cable
is connected to the pluggable screw terminal block; however it is provided strictly as a means of
testing the instrument, it should not be used in the final installation. The 8800 Series Trace Mois-
ture Analyzer is intended as a field wired instrument permanently connected and installed accord-
ing to the local, nationally recognized procedures for equipment of this type and stated power
requirements. For North American installations use UL 62 and/or CSA C22.2 No 49, 18AWG
cable with black, white, and green color codes. For European and other international installations
use CENELEC harmonized type cable, with 0.82mm wire size or equivalent 10 amp use, with
brown, light blue, and green/yellow stripe color codes. The power wiring must be connected to
the pluggable screw terminals marked AC LIVE (#1), AC NEUTRAL (#2), and AC GROUND
(#4). A switch or circuit breaker shall be included in the installation. It shall be in close proximity
to the equipment and within easy reach of the operator. It shall be marked as the disconnecting
device for the instrument. For the 8800B use the 1/2” NPT conduit fitting as the power cable
access, do not use the cable grips they are for low voltage use only.
3.3.2.1.2 Low Voltage DC Powered Option - Electrical Power Connection
When an 8800 Series Trace Moisture Analyzer is configured with the low voltage DC power
option, it can be powered by applying 15 to 30 VDC 0.5A, to the PS+ (#12) and RET (#11) plug-
gable screw terminals. The positive supply must be connected to PS+, while the negative or
ground to RET. The AC terminals must not be connected.
3.3.2.2 Sensor Connection
The sensor input terminals are labeled “SIG-IN” (#5) for the center core of the coaxial sensor
cable, and “SIG RET” (#6) for the outside braid of the cable. Factory supplied coaxial cables have
a BNC connector at one end to mate to the sensor, and pigtails at the other end to be placed in the
screw terminals of P1, the black pigtail is the braid and should be connected to the terminal
marked “SIG RET”. The coaxial cable can be as much as 3,000 ft. long, however if the cable is
changed for a longer or shorter one the instrument must be compensated for the new cable (see
section 3.4.5 -11). The instrument is properly compensated for the cable supplied from the fac-
tory. Consult your representative for obtaining the proper cable.
3.3.2.3 Wiring the Alarm Contacts
The optional alarm relay contacts are located on the terminal strip P1. The terminal strips are
marked to indicate wipers and normally open and normally closed contacts, of the two indepen-
dent relays corresponding to the HI and LO alarms. The relay contacts are rated at 10A 250VAC